It's a question that leaders of Pacific Island states have been asking for decades. As a warming climate drives sea levels upward, low-lying island nations face an uncertain future—or no future at all, say these leaders, who warn of their nations' imminent disappearance. Officials in Tuvalu, 600 miles (965 kilometers) north of Fiji, have been some of the most vocal critics of the world's large greenhouse gas emitters—industrialized nations such as the United States and China—which they accuse of not doing enough to curb emissions, contributing to the melting of ice sheets and rising seas. responsibility," Sopoaga told the climate summit delegates in Peru. "It keeps me awake at night. Will we survive? Or will we disappear under the sea?